If you like how Webroom functions, feel free to register for an account.
Chatzy feels like an old-school chatroom app, but with a ton of modern features.
You can get notified when someone says a certain word, send emojis, set up text expansion, and do much more.
This could be a much safer way to share sensitive files than to upload it on popular cloud storage providers.
It also has file-sharing between all of you, but it also adds Google Docs, Sheets, and Presentations so you can collaborate with your files so you can brainstorm while still having a chat.